Pump



sept; 9, 1924. 1,508,054'

A.. c. HoPKxNs mma June 2s, 192s 2 sheets-sheet 1 Sept. 9, 1924. l 1,508,054'

A. C. HOPKINS PUMP Filed June 23, 1925 2 Sheets-Sheet 2 VPatented Sept. 9, 1924.1 I i open at the top and having' a cover 11 se Amann. c. Horxrns, or ninas, Niemann.'

` r1-mr.

application nieuwe as, ma. seran4 No; 647,295.

To all'whom z't may concern: .s

' Be itknown that I, ARTHUR C. HOPKINS, a citizen ofthe United States, residin at Niles, in the county of Berrien and tate of Michigan, have invented a' new' and useful Improvement in Pumps, of which the following isa specification.

This invention relates to pumps and the.

like,and is fully described in the 'following specification, as shown in the accompanying drawings, in which Figure 1 is-a vertical, longitudinal section) through a pump embodying my invention. Fi ure 2 is' a transverse section in line 2-2 Iigure 1, and Figure 3 is asimilar section in line 3-3 Figure 1. y j' -This pump comprises a main casting cured thereto by means of bolts 12. A crankshaft 13 is journaled in suitable bearings 14 carried bythe maincasting 10 and has a gear 15 keyed thereon,'which meshes with f a pinion 16 which is keyed to a shaft 17 v a piston '"'letr passage 23 in which is form which is driven by any suitable sourcel of power not shown.

The crankhaft, as illustrated, has four cranks which are set 90 apart.- Each crank 'has a connectingrod 18 connectedthereto at its upper end and the lower end of the connecting rod beingv hingedly mounted on in 19 which is carried b a piston 20 w 'ch is '-slldably .mounte in the cylinder 21. The A'lower end muncates with Vthe sump 22 throu h an ina valve seat The valve 25l is adapted .to rest mic-:n the valve seat 24 and has a stem 26 w 'ch is slidable in the valve stem guide 27.

vlA spring- 28 normally holds the valve 25' wupon its seat.-

The lower end ofthe cylinder l21 also communicates with .the discharge -line 29 through an outlet o ening 30 which has an outwardly facing va ve seat31. This is nor- -mally closed by a valve 32the valve being held upon its seat by the spring 33.

This pump other liquids, and it will beunderstood from the foregoing, that as the crank-shaft 13 is.

turned so as to lift the piston 20, the suction reduced inthe cylinder21 will cause `the oil in the sum 22 to lift the valve 25,`

permitting some Ao this oil from the sump to flow into the lower part of the cylinder 21. As the piston descends, this oil will be of the cylinder 21 com-- is intended to` pump oil, or-

f conical opening 34 in which is rotatably mounted a plu valve 35 having a squared end 36-ada te to receive a wrench whereby it ma turned. A curved'passag'e 37 is forme in this plug valve having sides 38 which are separated from the passage 39,

As the plug valve 35'is shown-1n Figure 1 the passage 37 communicates with the end'v 29 of the discharge line andwith the pipe 40. 'At the same time, thepipe 41 communicates throu h the passage39 with the opening 42 whic opensinto the upper open space in the main casting 10.

It will thus be seen that with the plug valve 39l set, as shown in- Figures 1 and 3, the liquid forced out through the discharge line 29 -will pass through the passageA 37 into the pipe 40. From the `p1pe40 the .liquid vis returned, still under pressure,

through the pipe 41 and is forced up throu'ghvthe passage 39 and opening 42 into the upper portion of the pumpy which is prefera ly ept nearly full of oi re 1, it willl be 'tuid through the pipe 40 and 41, the plug n throughv the opening 42 into the upper porv tion of the pump.

Under some circumstances, it is necessary shall vary with a given crank-shaftspeed, and for this purpose, I have provided a series of openings 43, 44, 45 and 46, arranged .that the rate of discharge from the pump one above the other in the sideof the cyl.-

inder 21 so that they are successively uncovered lby the piston as it travels outwardly. A plate 47 lies along theback of all of these ho es and is held beween lateral guides 48 and 49. p

In the position shown in Figures 1 and 2, these lateral openings are closed by the plate -47 which is adjustably held upon its llU seat bymeans of screws 450. plate is provided, hovvever, With sets of variable openings l, 52, 53 and 54 which correspond in height 'With theopenings 43, 44, 45 and 46. The plate 47 may be moved to the left from the position shown in .Figure ly by means of the rod 55 which is attached `thereto. As the plate is moved to the left the upper openings 54 communicate with the upper holes 46. VVith' the plate in this position and the crank-shaft in operation, the vacuum of the cylinder 21 will be broken as soon' as the'piston 20 uncovers the upper hole 46 and the liquid Will then be drawn i through this hole and the opening 54 into the cylinder 2l. As the piston descends, the

`liquid will be forced back throughthis hole into the sump 22 until the piston passes the hole 46. With this hole closedby the piston the pressure generatedV inthe cylinder 2l Will force the liquid out into the discharge line 29, as beforafor the rest of the stroke.

`By moving the plate 47 still farther to the lett, the holes 45, 44 and 43 are successively uncovered, therebyl decreasing the amount of liquid forced into the discharge line on each downward stroke of the piston.

`Without departing from the spirit and scope or the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in vievv or the prior art.,

for said cylinder, aseries orn openings in 50 the Walls of said cylinder which are successively uncovered by said piston as it reciprocates and means for adjust'ably closing said openings. v

2. A pump having a cylinder, a piston reciprocable therein, inlet and outlet valves for said cylinder, a Lseries oiopenings in the Walls of said cylinder which are successively uncovered by said pistonvas it 4reciprocates/ and a vsliding' plate having holes therein for adjustably closing said openings.

I 3. A pump having a cylinder, a piston reciprocable therein, a sump, inlet and outlet valves for said cylinder, the inlet valves communicating vvith said sump, a passage communicating With ,said cylinder and sump which is uncovered by said piston 'as it re ciprocates, and means for progressively closing said passage longitudinally of the cylinder to control the volume delivered by said pump:

4. A pump having a cylinder, a piston reciprocable therein, a sump, inlet and outlet valves for lsaid cylinder, the'inlet valves communicating With ,said sump, a passage communicating Withsaid cylinder and sump which is uncovered by said piston as it reciprocates, and a sliding plate for progressively closing said passage longitudinally of the cylinder to control the volume de- `livered by said pump.

. ARTHUR C. l-lOlPllNS, 

